fix(device_info_plus): fix memory leak when calling DeviceInfoPlugin().macOsInfo

[codingiran]

Description

Fix memory leak when call DeviceInfoPlugin().macOsInfo in macOS.

Related Issues

[Bug]: device_info_plus memory leak in macOS

Checklist

• I read the Contributor Guide and followed the process outlined there for submitting PRs.
• I titled the PR using Conventional Commits.
• I did not modify the CHANGELOG.md nor the plugin version in pubspec.yaml files.
• All existing and new tests are passing.
• The analyzer (flutter analyze) does not report any problems on my PR.

Breaking Change

Does your PR require plugin users to manually update their apps to accommodate your change?

• Yes, this is a breaking change (please indicate that with a ! in the title as explained in Conventional Commits).
• No, this is not a breaking change.

[miquelbeltran]

Hello! Thanks for the contribution. The refactor and the change seem fine to me, but before approving I'd need to test it and also fix CI because seems like something broke with the installation scripts, that may delay this PR for a while.

I've also got a question regarding the use of enum.

[miquelbeltran]

Why is there a change from struct to enum?

[codingiran]

This API is designed as SystemUUID.getSystemUUID(), essentially just placing getSystemUUID() under the SystemUUID namespace.

There’s no need to declare a separate class or struct—using an enum is the most lightweight way to achieve this in Swift.

This is a common practice and also the default rule (enumNamespaces) in SwiftFormat.

[miquelbeltran]

Thank you! tested on M1 Pro